Telephone plug



L. O. MARSTELLER TELEPHONE PLUG Filed oct. 2. 1922 WITNESSES:

INVENToR Lester O. Mnvstelle.

` a BY mama!C Jini-'1, 1929.

=' vor wlnmsnnne, riinnarnvama, assIeNon 'ro tenerme-r y mnmonnrnne.

Anuntis; nea october s, im; .seran ne. 591,801.

Myn-invention' relates to telephone pings. having particularrelation to thegconnection of the telephone' cord with the.ffcontacting- 'elements o tlieplu'g.I f

, In its broadest as ect, one object of my vention is' to provi e a tele hone-plug struc-' ture carrying. means where ftele hone tips may be removabl connecte to t e contact lportion ofthe p ug structure without the ic' use of tools or the necessity for removing any portion'of said plug structure 21nd,' at

the Sametime, insuring an exceptionaliyv V firm electrical contact and a smooth mechan- Se illustrated' in plane being in ical contact Between the several'elernenta.

v Another object ofmy invention 1s to pro` vide a telephone-pli1gl construction of simple, com act and rugged design'which 1s susceptib e of inexpensivel quantity-producof the imola 1li'. -is insulated .from the core member 11 tion'methods of manufacture Withexistin vautomatic machinery,4 the several parteA o 'which may be made vsfitlr-a'mirn'mnin ex telephone@ u block of ins at1ng. materal carrying cofnf tact-plug elements at'oneend -thereoffand cooperating socketcontact elements at an opposite end, 4the'socltet. elements being designed toremovab1y and resiliently eneo gage `the tips of a telephone cord-.- W'th these and other objects and' applica-4` tions inview,- m '.-invention further consists in the .details o -constru`ctionand arrange'.

ment hereinafter described. and `claimed. and

wherein.y ,y Figure 1 isaigreatly'enlarged longitudi- 'nsl sectional lview 'of a tele hone-plug ele- .ment embodyin my invention, thesection rig.-A e` isi rend -elevaimtgvalefne `structnreshownin-Figl;

Fig. 3 isa-view si socket element before bending. f

y vention is shown a 'cylindrical'.block' 1v of; bakelte, hardcrubber or yother.finsiilating` form recesses 8 and 9. y

of `co-operating "extending beyon Ythe"v accompanying drawing.;- v

Y f Wa of illustration, the contact elements 19 ar toA Fig. 2,-but Witlit the cap removed5 illustrating{oneporxnof..z

. resilient contact-socket'l elementi applicable to the structure of Fig."1. 'i l Fig. 4 is anenlarged detailview kof the as he aeragly t In the `illustrated embodiment efmyiiimaterial, having opposite ends 2 and 3.

otherjendf of the block -isiprovided with borings 6 and 7 Which'are `countersunla: to

A core member 11 of brass or other con# `ducting material is positioned in the perfor! ation e and Vextended beyond the ends 2 and -3 of the block 1 to form projections 12 and 13, respectively. Thev rejection. 12 may terminate in a contact ob 14 having a fi UN.l'ran{QSTATEs? PjljEimjfforFlcs.

of brass or other' conducting material inb means of an insulating spacing member 1;;

s interposed therebetween and b means of a y Aceordin 'to my invention,. I provide a: construction 'comprising' .a

WasherV 3.8 between tbe end o the tubular member 16 and the shoulder 15 of the'lmob 14. The contacting? snrfaceso the plug conu {struction just described' are formed by the knob 14 and the onterexposed surface of the tubular member 16. f

borings 6 and 'Z' provide space fory the ends lng elements 22 .and 23 the socket elements. By

an 21 are shown in the form of annular shoulder portion 15. A. tubular member 16 Y zey tabs 24 and 25, respectively. `The annular f 'helicalspring members Vmay be formed by "bending asingrle helical-spring member 26,. as shown in Fig. 4, into the form of a ring. f The-springs may be made ofdsuch material hor-bronze or stainlessy steel, prefe latter since it admits of a heating treatment necessary in some forms of spring 'f mountings.

Alcapmembei-Q? is employed ffor secur-` n ing, the spring-socket elements in position and is provided with perforations 28', .29 'Y and 31 corresponding in .diameter and in jpositionto the I6 and Y7 .andthe f M 1 perforation 4 in the main supporting block 1, respectively. Adjacentto the boring 7 in the main supporting block 1 is an auxiliary perforation 32 which extends parallel to the main perforation 4. and is designed to receive the terminal tab 25. The cap member 27 is also provided with an auxiliary perforation 33 designed to receive the terminal tab 24 of the spring element 19.

lat

In assembling the several socket parts just mentioned, the annular springs l9- and 21 are first fitted into the recess 8 and 9, respectivel and the terminal tab 25 is caused to exten through the auxiliary perforation 32. The terminal tab 25 is then secured in electrical contact with the tubular plug element 16 by inserting the tab 25 between the vside of the recess 5 and the adjacent surface of the tubularmember 16, thereby connecting the socket receptacle 21 to one of the contact elements 16 of the plug construction. The members 1 and 27 are then placed together, with the several perforations and openings in alignment. The portion 13 of the core member l1, which extends beyond 'the end of the block l, is threaded to re ceive a clamping nut 34. The several foregoing portions of the construction may readily be secured in position on screwing the clamping nut 34 into engagemenbwith the outer surface of the cap member 27.

The terminal tab 24 of the socket element 19 is caused to extend through the auxiliary perforation 33 in the cap member 27 and is secured to the core member 11, thereb connecting the remaining contact-plug e ement to the socket element 19. As a matter Vof convenience,'the cap member 27 may have a d1- -ameter slightly greater than that of the main supportingmember 1 to provide gripping means for removing the plug construction from va evo-operating socket (not shown). v

In operation, the tips 22 and 23 of a telephone cord 35 are first actuated into engagementvwith the socket elements 19 and 21, re-

spectivel entering the same .from the `outer side of t e cap member 27. I-The tips 22 and Y 23 are then held in sliding contact with the socket elements.- The ,foregoing construction is particularly applicable to radio ap paratus, inasmuch as it lpermits a single vtelephone plug element to serve as a terminal connection for a loud-speaking device orfor an ordinary telephone receiver without the necessity of removing the plug structure or any parts thereof. While I have-shown only one embodiment of my invention, for the purpose of describing the same and illustratin its ap lications, it is apparent that various modifica'- tions maybe made in the constructional details thereof ,withouty departing from the spirit and scope of my invention. I desire, therefore, that only such limitations shall be Leer, te?

-provided with a countersunk perforation extending therebetween, said members and element being positioned in the. countersunk portion of said perforation, said core memberextending through said perforation to the remaining end of said block, said latter end having a pair of spaced borings, a socket contact element individual to each boring and adapted to removably and resiliently receive a plug, and means electrically connecting said members and said socket elements, respectivel 2. ln combination, a core member, a tubular member enclosing said core member, a tubular insulatingv element interposed ben tween said two members, said two members having exposed contacting surfaces, an insulating block having opposite ends and pron vided with a perforation therebetween, said perforation being countersunk at Vone end to receive said members and element,=said core member extending through said perforation to the remaining end, means co-operatin with said core and said block, whereby sai members and core are rigidly secured 1n pcf-- sition, said last mentioned end having a pair of spaced countersunk borings, latef :illy resilient contact socket elements positioned in the lcountersunk portion of each boring, a cap having complementarily aligned perfo- 105 rations for securing said socket elements in position and means for electrically connecting said members and said socket elements, respectively.

3. In combination, a core member, tu- 1w bular member enclosing said core member,v a tubular insulating element interposed between said two members, said two members having exposed contacting surfaces, an insulating block havin opposite ends and 116 provided with a per eration therebetween, said perforation being countersunlr at one end to receive said members and element, said coremember extending through said perforation to the remaining end, said last i' ing an auxiliary guideway, a vresilient'ten ,member having complementari ber, 4respectively, and means for securing the parts in osltion.

4. In com ination,y a member having a plurality of countersunk borings, a second rforations, each countersunk boring hav-v sion socket element disposed in each countersunk portionl and having terminal tabs extending through said auxiliary guideways, a pair of `contact plug elements extending rom one of said 'members and connected respectively to said' terminal tabsand means co-operating with the several parts for securing the same in position.

5.' In comb1nat1on, a member having a 'plurality of countersunkl borings, a second member having -complementarily arranged perforati'ons, an annular helical contact element disposed in each countersunk portion y and` having terminal tabs, a pair of contact y arranged A countersunk plug elements extending from one of said members `and connected respectively to said terminal tabs, and means for securing the parts in positions.

6. In combination, a member of cylindrical shape having a plurality of countersunk borings, a second cap member having complementarily arranged perforations, the

diameter of said cap being greater than that,

of said cylindrical member, laterally resilient socket contact elements disposed in each tabs, a pair o Contact plug elements extending from one of said members and connected Portion and having terminal respectively to said-terminal tabs, and means for securing the parts in position.

In testimony whereof, I havehereunto Subscribed my'name this 16th day of September,'`1p922. j I sY LEsTEno. MARSTELLER. 

